How to create sidebar
By Elementor page builder you can easily create your own sidebar as you like it – left sidebar, right sidebar, dual sidebar. All you need is to create new section on your page and select the width of the columns.
Example for Left / Right Sidebar
Edit with Elementor the page you want to have a sidebar. Add new section and select a structure with two columns. Set the column width – edit column, go to Layout section and adjust the Column width (%), for example 65% for left column width and 35% for right column width.
You can use all widgets and create in the right column the sidebar you need. You can also create a separate (external) template and use it in the sidebar column with Elementor Global Template widget. The advantage of using this widget is that the changes to the external template will be applied to every page where you use the template with Elementor Global Template widget.
Example for Dual Sidebar
Edit with Elementor the page you want to have a dual sidebar. Add new section and select a structure with three columns. Set column width by edit the columns, navigate to Layout section and adjust 25% width for left and right column and 50% width for the column in the middle. You can play with the columns width to fit your needs.
You can use all the available widgets to create the sidebars content. Or as we said previously you can use Elementor Global Template widget to include a templates into the sidebars.